package com.app.common.utils;

import java.util.Random;

public class PasswordCreateUtil
{
    /**
     * 获得密码
     * 
     * @param len
     *            密码长度
     * @return
     */
    public static String createPassWord(int len)
    {
        int random = PasswordCreateUtil.createRandomInt();
        System.out.println(random);
        return PasswordCreateUtil.createPassWord(random, len);
    }
    
    public static String createPassWord(int random, int len)
    {
    	Random rd = new Random(random);//有种子的构造方法
        final int maxNum = 62;
        StringBuffer sb = new StringBuffer();
        int rdGet;// 取得随机数
        char[] str = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
        
        int count = 0;
        while(count < len)
        {
            rdGet = Math.abs(rd.nextInt(maxNum));// 生成的数最大为62-1
            if(rdGet >= 0 && rdGet < str.length)
            {
                sb.append(str[rdGet]);
                count++;
            }
        }
        return sb.toString();
    }
    
    public static int createRandomInt()
    {
        // 得到0.0到1.0之间的数字，并扩大100000倍
        double temp = Math.random() * 100000;
        // 如果数据等于100000，则减少1
        if(temp >= 100000)
        {
            temp = 99999;
        }
        int tempint = (int) Math.ceil(temp);
        return tempint;
    }
    
    @SuppressWarnings("static-access")
	public static void main(String[] args)
    {
        PasswordCreateUtil pwc = new PasswordCreateUtil();
        System.out.println(pwc.createPassWord(6));
        
    }
}